CompTIA Data+ (DA0-002)Data Concepts and EnvironmentsEasy
A data scientist is preparing a dataset for a machine learning model that predicts customer churn. The dataset contains a column named 'Region' with values like 'North', 'South', 'East', 'West', and 'Central'. These values represent distinct geographical areas without any inherent order or numerical relationship. Which data type BEST describes the 'Region' column?
- ANominal
- BRatio
- CInterval
- DOrdinal
Show answer & explanationAnswer & explanation
Correct answer: A. Nominal
Nominal data consists of categories that have no intrinsic order or ranking. Geographical regions like 'North', 'South', 'East', 'West', and 'Central' are distinct categories without any inherent numerical or ordered relationship, making them nominal.
Why the other options are wrong
- B. Ratio data has ordered categories, equal intervals, and a true zero point.
- C. Interval data has ordered categories with equal intervals, but no true zero.
- D. Ordinal data has categories with a meaningful order, which is not the case here.
Nominal Data
A type of qualitative data that represents categories without any intrinsic order or numerical value. It's used for labeling variables without any quantitative value.
- Categories have no inherent order or ranking.
- Used for classification or labeling.
- Examples include gender, marital status, colors, regions.
Memory trick: NOIR: Nominal is Names, Ordinal is Orders, Interval is Intervals, Ratio is Real Zero.